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When this happens, does she fall over on her side and look straight ahead for a few minutes to a few seconds?
That's what I thought. Many do this when they have heart problems. You should take this very seriously and should see your vet tomorrow.
Many dogs will do this when they get excited like when you come home from work, when you take them out for a walk or when you are playing. They seem to be perfectly normal at other times.
If your dog has not been on heartworm prevention, this is even more of an indicator that there could be a heart problem.
I suggest that you see the vet first thing tomorrow. Until then, you should keep her crated/calm.
There are many effective treatments for heart disease.
Please let me know if you still have questions about this.